When you think “fiber,” chances are you also think “bowel movement.” But fiber, the indigestible part of plant-based foods, does so much more than keep us regular. Fiber fights the “big five”—heart disease, stroke, high blood pressure, diabetes, and obesity—says James Anderson, MD, chair of the National Fiber Council. Fiber lowers cholesterol, stabilizes blood sugar, prevents gastrointestinal issues, and protects against cancer.